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In the daily GBP/USD chart above, we have a 10 period EMA in blue, a 20 period EMA in red, and an MACD along the bottom. In mid-October, the 10 EME crossed above the 20 EMA, a signal to buy. At the same time, the MACD made an upwards crossover, another bullish signal.
If you had followed these signals and placed a buy trade, you would have made a decent profit out of the uptrend that followed.
Later in the chart, both the MACD and the moving averages were giving bearish signals, indicating that it may be a good opportunity to place a short trade. And sure enough, if you had done so, you would have made a decent profit.
However, these crossover signals can sometimes mislead, giving false signals or “fakeouts” – as we can see in the following chart:
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In mid-March, the MACD gave a buy signal, but the moving averages didn’t give any signal. If you had acted on the isolated buy signal from the MACD, you would have been caught out by a fakeout.
By the same token, the MACD’s bullish crossover at the end of May wasn’t matched up with a crossover in the moving average. If you had placed a buy trade at that point, you would have made a loss as the price fell after that.